Valve won. Maybe it's lucky timing, or maybe Gabe is actually a genius, but it's only going to get worse for Windows as there is no way in hell Microsoft shifts resources from AI projects to make Windows better for PC gaming. Recently, Capcom announced that their PC gaming sales surpassed their console sales, and I don't think it's likely we'll see that trend changing, and it's also likely other publishers will make similar announcements soon (although idk if they count SteamOS as a console). The Switch 2 is coming out soon, but people already say it's too expensive, and there are controversies surrounding some of their product decisions.
Will this bring about the era of the Linux desktop? Idk, but the era of the Linux gaming PC is inevitable now.